MIP-Coated Microbeam Mass Sensing Utilizing Noise Squeezing Effect in Parametric Resonance
- Author(s): Li, Lily L.
- Advisor(s): Turner, Kimberly L
- et al.
A real-time explosive gas sensing (DNT) in atmospheric pressure utilizing the noise
squeezing eect that occurs before a bifurcation event is investigated. A noise-squeezing
controller based on the statistics of phase noise is implemented using high-speed Lab-
VIEW eld programmable gated array. A high frequency TNT-molecularly imprinted
xed-xed microbeam sensor utilizes this nontraditional sensing strategy and performs
DNT sensing at various concentrations. Experiments are conducted using both noisebased
and sweep-based bifurcation tracking for a direct comparison. Results demonstrate
noise-based bifurcation tracking is not only capable of performing reliable frequency
tracking, but also show the method is superior to the bifurcation sweep-based
tracking. Over three orders of magnitude improvement in acquisition rate is achieved,
and as a result, condence and precision on bifurcation frequency estimation is signi-
cantly improved over the bifurcation sweep tracking method, enabling DNT sensing at
concentrations much below sub-ppb (parts-per-billion) level.